Yaw control method for wind turbine

Abstract

The present invention discloses a yaw control method for a wind turbine. Different levels of yaw errors are set for different wind speeds, and three levels of yaw errors are set for each wind speed. Multiple time periods are set for the same wind speed, and four time periods are set for the same wind speed. By judging the relationship between the measured wind speed and wind direction data in multiple time periods and each yaw error level at this wind speed, different yaw strategies are adopted, so as to correspondingly control the wind turbine to stop, operate at reduced power, operate normally or start yawing. Thereby, it is ensured that the wind turbine can yaw against the wind more accurately and timely, reduce the load of the wind turbine, improve the power generation performance of the wind turbine, extend the service life of the yaw system, and ensure the safe operation of the wind turbine. Moreover, through the statistics of the yaw cumulative error times, an objective basis is provided for timely checking and overhauling the yaw system, further ensuring the safe operation of the wind turbine.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine control, and particularly to a yaw control method for a wind turbine. Background Art

[0002] The yaw system is an important part of a wind turbine. When there is a certain wind direction deviation during the operation of the wind turbine, the yaw system will drive the wind turbine to align with the wind.

[0003] Whether the yaw system can align with the wind in time will affect the power generation of the wind turbine and may lead to an increase in load, while frequent alignment with the wind by the yaw system will affect the service life of the yaw system.

[0004] Currently, most yaw strategies of wind turbine manufacturers are to calculate the yaw error within a certain period of time. If it is greater than the set value, yawing is performed. Since the time range setting of this method is not fine enough, there is a large wind direction deviation within the range before reaching the set time, which affects the safety and power generation performance of the wind turbine. Summary of the Invention

[0005] To solve some or all of the technical problems existing in the above-mentioned prior art, the present invention provides a yaw control method for a wind turbine. The yaw control method for a wind turbine includes: setting different levels of yaw errors for different wind speeds. Three levels of yaw errors are set for each wind speed, including a first-level yaw error set value P1, a second-level yaw error set value P2, and a third-level yaw error set value P3, where the first-level yaw error set value P1 < the second-level yaw error set value P2 < the third-level yaw error set value P3; setting multiple time periods for the same wind speed. Four time periods are set for the same wind speed, including a first time period T1, a second time period T2, a third time period T3, and a fourth time period T4, where the first time period T1 < the second time period T2 < the third time period T3 < the fourth time period T4, and the specific implementation steps of the yaw control method for a wind turbine include:

[0006] Step 1: Obtain the wind speed and wind direction data within the first time period T1 measured by the wind measurement device, and compare the measured wind speed and wind direction data with the yaw error level at the wind speed. If the measured wind speed and wind direction data exceed the third-level yaw error set value P3 at the wind speed, control the wind turbine to stop; if the measured wind speed and wind direction data do not exceed the third-level yaw error set value P3 at the wind speed, perform Step 2;

[0007] Step 2: Obtain the wind speed and direction data within the second time period T2 measured by the wind measurement device, and compare the measured wind speed and direction data with the yaw error level at the said wind speed. If the measured wind speed and direction data exceed the secondary yaw error set value P2 at the said wind speed, then control the wind turbine to operate at reduced power; if the measured wind speed and direction data do not exceed the secondary yaw error set value P2 at the said wind speed, then continue to compare whether the measured wind speed and direction data exceed the primary yaw error set value P1 at the said wind speed. If the measured wind speed and direction data exceed the primary yaw error set value P1 at the said wind speed, then execute Step 3; if the measured wind speed and direction data do not exceed the primary yaw error set value P1 at the said wind speed, then keep the wind turbine operating normally;

[0008] Step 3: Obtain the wind speed and direction data within the third time period T3 measured by the wind measurement device, and compare the measured wind speed and direction data with the yaw error level at the said wind speed. If the measured wind speed and direction data exceed the primary yaw error set value P1 at the said wind speed, then execute Step 4; if the measured wind speed and direction data do not exceed the primary yaw error set value at the said wind speed, then record that the number of wind direction errors +1, and when the cumulative number of recorded wind direction errors within 24 hours reaches N times, start yawing to align with the wind;

[0009] Step 4: Obtain the wind speed and direction data within the fourth time period T4 measured by the wind measurement device, and compare the measured wind speed and direction data with the yaw error level at the said wind speed. If the measured wind speed and direction data exceed the primary yaw error set value P1 at the said wind speed, then start yawing to align with the wind; if the measured wind speed and direction data do not exceed the primary yaw error set value P1 at the said wind speed, then record that the number of yaw errors +1, and when the cumulative number of recorded yaw errors reaches M times, control the wind turbine to shut down, and at the same time, repair the yaw brake friction plate and the yaw motor friction plate.

[0010] Further, in the above wind turbine yaw control method, the primary yaw error set value P1 is set to 6° - 12°, the secondary yaw error set value P2 is set to 10° - 16°, and the tertiary yaw error set value P3 is set to 14° - 20°.

[0011] Further, in the above wind turbine yaw control method, the primary yaw error set value P1 is set to 12°, the secondary yaw error set value P2 is set to 16°, and the tertiary yaw error set value P3 is set to 20°.

[0012] Further, in the above yaw control method for a wind turbine generator, the first time period T1 is set to 60 s, the second time period T2 is set to 90 s, the third time period T3 is set to 120 s, and the fourth time period T4 is set to 150 s.

[0013] Further, in the above yaw control method for a wind turbine generator, the cumulative number of wind direction error records N within 24 hours is set to N = 15 - 20.

[0014] Further, in the above yaw control method for a wind turbine generator, the cumulative number of wind direction error records N within 24 hours is set to N = 20.

[0015] Further, in the above yaw control method for a wind turbine generator, the cumulative number of yaw error records M is set to M = 2000 - 2200.

[0016] Further, in the above yaw control method for a wind turbine generator, the cumulative number of yaw error records M is set to M = 2200.

[0017] The yaw control method for a wind turbine generator of the present invention has the following advantages and beneficial effects:

[0018] In the yaw control method for a wind turbine generator of the present invention, multiple different levels of yaw errors are set for different wind speeds, and multiple time periods are set for the same wind speed. By judging the relationship between the wind speed and wind direction data measured within multiple time periods and each yaw error level at this wind speed, different yaw strategies are adopted, thereby correspondingly controlling the wind turbine generator to stop, operate at reduced power, operate normally, or start yawing. Thus, it is ensured that the wind turbine generator can yaw against the wind more accurately and timely, reduce the load of the wind turbine generator, improve the power generation performance of the wind turbine generator, extend the service life of the yaw system, and ensure the safe operation of the wind turbine generator. Moreover, through the statistics of the cumulative yaw error times, an objective basis is provided for timely checking and maintaining the yaw system, further ensuring the safe operation of the wind turbine generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0020] Figure 1 is a flowchart of the yaw control method for a wind turbine generator of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and the corresponding drawings. Apparently, the described embodiments are only a part rather than all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the scope of protection of the present invention.

[0022] See Figure 1 , the yaw control method of the wind turbine of the present invention includes: setting different levels of yaw errors for different wind speeds, and setting three levels of yaw errors for each wind speed, including the first-level yaw error setting value P1, the second-level yaw error setting value P2, and the third-level yaw error setting value P3, where the first-level yaw error setting value P1 < the second-level yaw error setting value P2 < the third-level yaw error setting value P3; setting multiple time periods for the same wind speed, and setting four time periods for the same wind speed, including the first time period T1, the second time period T2, the third time period T3, and the fourth time period T4, where the first time period T1 < the second time period T2 < the third time period T3 < the fourth time period T4, and the specific implementation steps of the yaw control method of the wind turbine include:

[0023] Step 1: Obtain the wind speed and wind direction data within the first time period T1 measured by the wind measurement device, and compare the measured wind speed and wind direction data with the yaw error level at the wind speed. If the measured wind speed and wind direction data exceed the third-level yaw error setting value P3 at the wind speed, control the wind turbine to shut down; if the measured wind speed and wind direction data do not exceed the third-level yaw error setting value P3 at the wind speed, execute Step 2;

[0024] Step 2: Obtain the wind speed and wind direction data within the second time period T2 measured by the wind measurement device, and compare the measured wind speed and wind direction data with the yaw error level at the wind speed. If the measured wind speed and wind direction data exceed the second-level yaw error setting value P2 at the wind speed, control the wind turbine to operate at a reduced power; if the measured wind speed and wind direction data do not exceed the second-level yaw error setting value P2 at the wind speed, continue to compare whether the measured wind speed and wind direction data exceed the first-level yaw error setting value P1 at the wind speed. If the measured wind speed and wind direction data exceed the first-level yaw error setting value P1 at the wind speed, execute Step 3; if the measured wind speed and wind direction data do not exceed the first-level yaw error setting value P1 at the wind speed, keep the wind turbine operating normally;

[0025] Step 3: Obtain the wind speed and wind direction data within the third time period T3 measured by the wind measurement device, and compare the measured wind speed and wind direction data with the yaw error level at the wind speed. If the measured wind speed and wind direction data exceed the first-level yaw error setting value P1 at the wind speed, then execute Step 4; if the measured wind speed and wind direction data do not exceed the first-level yaw error setting value at the wind speed, then record that the wind direction error count +1, and when the cumulative wind direction error count recorded within 24 hours reaches N times, start yawing to align with the wind.

[0026] Step 4: Obtain the wind speed and wind direction data within the fourth time period T4 measured by the wind measurement device, and compare the measured wind speed and wind direction data with the yaw error level at the wind speed. If the measured wind speed and wind direction data exceed the first-level yaw error setting value P1 at the wind speed, then start yawing to align with the wind; if the measured wind speed and wind direction data do not exceed the first-level yaw error setting value P1 at the wind speed, then record that the yaw error count +1, and when the cumulative yaw error count recorded reaches M times, control the wind turbine to stop, and at the same time, repair the yaw brake friction plate and the yaw motor friction plate.

[0027] Furthermore, in the yaw control method of the wind turbine of the present invention, the setting values of the yaw errors at each level for each wind speed can be determined according to the actual situation. As an example, the first-level yaw error setting value P1 can be set to 6° - 12°, the second-level yaw error setting value P2 can be set to 10° - 16°, the third-level yaw error setting value P3 can be set to 14° - 20°, and the values of P1, P2, and P3 need to satisfy: P1 < P2 < P3.

[0028] Preferably, the first-level yaw error setting value P1 is set to 12°, the second-level yaw error setting value P2 is set to 16°, and the third-level yaw error setting value P3 is set to 20°.

[0029] Furthermore, in the yaw control method of the wind turbine of the present invention, each time period for the same wind speed can be determined according to the actual situation. As an example, the first time period T1 can be set to 60s, the second time period T2 can be set to 90s, the third time period T3 can be set to 120s, and the fourth time period T4 can be set to 150s.

[0030] Furthermore, in the yaw control method of the wind turbine of the present invention, the cumulative wind direction error count N recorded within 24 hours can be determined according to the actual situation. As an example, the cumulative wind direction error count N recorded within 24 hours can be set to N = 15 - 20.

[0031] Preferably, the cumulative wind direction error count N recorded within 24 hours is set to N = 20.

[0032] Further, in the yaw control method of the wind turbine of the present invention, the recorded cumulative yaw error count M can be determined according to actual conditions. As an example, the recorded cumulative yaw error count M can be set to M = 2000 - 2200.

[0033] Preferably, the recorded cumulative yaw error count M is set to M = 2200.

[0034] In summary, in the yaw control method of the wind turbine of the present invention, multiple different levels of yaw errors are set for different wind speeds, and multiple time periods are set for the same wind speed. By judging the relationship between the measured wind speed and wind direction data within multiple time periods and each yaw error level at this wind speed, different yaw strategies are adopted, thereby correspondingly controlling the wind turbine to stop, operate at reduced power, operate normally, or start yawing. Thus, it is ensured that the wind turbine can yaw against the wind more accurately and timely, reduce the load of the wind turbine, improve the power generation performance of the wind turbine, extend the service life of the yaw system, and ensure the safe operation of the wind turbine. Moreover, through the statistics of the yaw cumulative error count, an objective basis is provided for timely checking and maintaining the yaw system, further ensuring the safe operation of the wind turbine.

[0035] It should be noted that in this article, unless otherwise clearly specified and defined, the term "connection" or its synonyms should be understood in a broad sense. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood according to specific circumstances. Moreover, expressions such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. At the same time, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. In addition, "front", "rear", "left", "right", "upper", and "lower" in this article are all referenced with the placement state shown in the drawings.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A yaw control method for a wind turbine, characterized in that, The yaw control method for the wind turbine includes: setting different levels of yaw error for different wind speeds, with three levels of yaw error set for each wind speed, including the first-level yaw error set value P1, the second-level yaw error set value P2, and the third-level yaw error set value P3, where the first-level yaw error set value P1 < the second-level yaw error set value P2 < the third-level yaw error set value P3; setting multiple time periods for the same wind speed, with four time periods set for the same wind speed, including the first time period T1, the second time period T2, the third time period T3, and the fourth time period T4, where the first time period T1 < the second time period T2 < the third time period T3 < the fourth time period T4, and the specific implementation steps of the yaw control method for the wind turbine include: Step 1: Obtain the wind speed and direction data within the first time period T1 measured by the wind measurement device, and compare the measured wind speed and direction data with the yaw error level at this wind speed. If the measured wind speed and direction data exceed the third-level yaw error set value P3 at this wind speed, then control the wind turbine to stop; if the measured wind speed and direction data do not exceed the third-level yaw error set value P3 at this wind speed, then execute Step 2; Step 2: Obtain the wind speed and direction data within the second time period T2 measured by the wind measurement device, and compare the measured wind speed and direction data with the yaw error level at this wind speed. If the measured wind speed and direction data exceed the second-level yaw error set value P2 at this wind speed, then control the wind turbine to operate at reduced power; if the measured wind speed and direction data do not exceed the second-level yaw error set value P2 at this wind speed, then continue to compare whether the measured wind speed and direction data exceed the first-level yaw error set value P1 at this wind speed. If the measured wind speed and direction data exceed the first-level yaw error set value P1 at this wind speed, then execute Step 3; if the measured wind speed and direction data do not exceed the first-level yaw error set value P1 at this wind speed, then keep the wind turbine operating normally; Step 3: Obtain the wind speed and direction data within the third time period T3 measured by the wind measurement device, and compare the measured wind speed and direction data with the yaw error level at this wind speed. If the measured wind speed and direction data exceed the first-level yaw error set value P1 at this wind speed, then execute Step 4; if the measured wind speed and direction data do not exceed the first-level yaw error set value at this wind speed, then record that the number of wind direction error times +1, and when the cumulative number of wind direction error times recorded within 24 hours reaches N times, start yawing to align with the wind; Step 4: Obtain the wind speed and wind direction data within the fourth time period T4 measured by the anemometry equipment, and compare the measured wind speed and wind direction data with the yaw error level at the wind speed. If the measured wind speed and wind direction data exceed the first-level yaw error setting value P1 at the wind speed, start yawing to align with the wind; if the measured wind speed and wind direction data do not exceed the first-level yaw error setting value P1 at the wind speed, record that the yaw error count +1, and when the cumulative yaw error count reaches M times, control the wind turbine to stop, and at the same time, repair the yaw brake friction plate and the yaw motor friction plate.

2. The yaw control method for a wind turbine according to claim 1, wherein The first-level yaw error setting value P1 is set to 6° - 12°, the second-level yaw error setting value P2 is set to 10° - 16°, and the third-level yaw error setting value P3 is set to 14° - 20°.

3. The yaw control method for a wind turbine according to claim 2, wherein, The first-level yaw error setting value P1 is set to 12°, the second-level yaw error setting value P2 is set to 16°, and the third-level yaw error setting value P3 is set to 20°.

4. The yaw control method for a wind turbine unit according to claim 1, characterized in that, The first time period T1 is set to 60s, the second time period T2 is set to 90s, the third time period T3 is set to 120s, and the fourth time period T4 is set to 150s.

5. The yaw control method for a wind turbine according to claim 1, wherein The cumulative wind direction error count N recorded within 24 hours is set to N = 15 - 20.

6. The yaw control method for a wind turbine according to claim 5, wherein The cumulative wind direction error count N recorded within 24 hours is set to N = 20.

7. The yaw control method of a wind turbine according to claim 1, characterized in that The cumulative yaw error count M recorded is set to M = 2000 - 2200.

8. The yaw control method for a wind turbine according to claim 7, wherein The cumulative yaw error count M recorded is set to M = 2200.

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